third base

noun3

1. •
   The base after second base in a counter-clockwise path around a baseball infield.

   • The runner reached third base with a stand-up triple.
2. •
   (slang, figurative) Touching another person’s genitals in a sexual manner; mutual masturbation.
3. •
   The betting spot located immediately to the right of the dealer, which is last to act.